Celtics center Kendrick Perkins had arthroscopic surgery on his left shoulder Tuesday and is expected to be ready for the start of next season.
Perkins was hurt last week while working out at the team's practice facility in Waltham. He dislocated the same shoulder late in practice Feb. 8 and sat out 13 games before returning March 12.
"We fully expect him back for the start of the season," although he may not be ready when training camp begins about a month earlier in early October, said Jeff Twiss, the Celtics' vice president of media services and alumni relations. "The surgery is more just to tighten the capsule around the (shoulder) joint."